Abstract
Recently,there has been a growing interest to develop microscale devices that can manipulate and transport relatively small volumes of fluids.In this study,we investigated the influence of wall surface conditions and polymer addition on microchannel flow.We measured the pressure drop in microchannel flow for three patterns of channel height h = 100,50,20 μm.Tested channel surface roughness are Ra = 0.2,0.8,1.6 μm.The experiment showed that the pressure drop increased with increase of channel surface roughness as in the case of both hydrophilic and hydrophobic surface.For polymer solution,the pressure drop decreased in all roughness.Drag reduction rate was increased with the increase of surface roughness.
